Morticia Addams is an assassin with deadly skills. She is devoted to her job and would never think about betraying her organization. However, she was killed by her boss, who believed she had betrayed him. When she opened her eyes, she found herself being alive inside of the new body with the same appearance as her. The owner of the body was Princess Elysia Satriya Novaria, the eldest princess of the Novaria Kingdom. As Novaria Kingdom's newest, eldest princess, what kind of life is in waiting for her?